The act of executing such a smelly shit that after a while your noes become ignorant to the rancid smell emanating from your buttocks, however as soon as you open the door and your nose has something to compare the smell of your shit too, it's too late and you have passed out.

You:*comes out the toilet*
Friend: Urgh!!! Dude did you just drop a shitomic bomb? because I can no longer feel my legs...
- you both continue to pass out